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All Journal AUSTENIT CHEMICA Jurnal Teknik Kimia Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Jurnal Abdi Insani Teknomekanik International Journal of Science and Environment JURNAL REKAYASA KIMIA & LINGKUNGAN
Aprianti, Tine
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Journal : Teknomekanik

 1 
Performance Comparison of Ground Source Heat Pump (GSHP) against Air Source Heat Pump (ASHP) for Domestic Applications: A case study in Perth, Australia Aprianti, Tine; Tan, Evan; Diu, Chan; Sprivulis, Ben; Ryan, Greg; Srinivasan, Kandadai; Chua, Hui Tong
Teknomekanik Vol. 4 No. 2 (2021): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.551 KB) | DOI: 10.24036/teknomekanik.v4i2.11272

Abstract

The goal of this research is to evaluate the efficacy and practicality of installing a ground source heat pump (GSHP) with an air source heat pump (ASHP) in a residential setting. The results of this comparison were obtained by monitoring each of the systems in two almost identical residences in Perth, Western Australia. There is an open-loop groundwater system in the previous home. Each residence has one family whose air conditioning system has its own set of operational needs. The cooling capacity supplied and coefficient of performance (COP) as a function of seasonal changes in ambient temperatures were determined using data gathered from both residences over a two-year period. For both heating and cooling, the GSHP system COP was found to be greater than that of the ASHP system. Furthermore, these two performance measures were independent of ambient circumstances in the former, but they exhibit a noticeable ambient dependent trend in the latter. The GSHP had an average COP of 4.0 for heating, regardless of external conditions, while the ASHP COP ranged from 2.0 to 3.0. Conversely, the GSHP had an average COP of 3.2 for cooling, whereas the ASHP COP ranged from 1.4 to 2.9. It is found that GSHPs result in significant operational cost reductions and a significant decrease in greenhouse gas emissions when a borewell is part of a home.
Experimental study of gas adsorption using high-performance activated carbon: Propane adsorption isotherm Aprianti, Tine; Hapsari, Harrini Mutiara; Permata, Debby Yulinar; Aprilyanti, Selvia; Sobey, Justin; Pham, Kallan; Kandadai, Srinivasan; Chua, Hui Tong
Teknomekanik Vol. 7 No. 1 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v7i1.28672

Abstract

Activated carbon is widely used for its diverse adsorptive abilities, with a vast range of current and emerging uses. This study developed a data set for high-performing activated carbon, its adsorption abilities with differing adsorbents, and an understanding of what deviations are present compared to the widely used adsorption models. This study included the construction of Tóth isotherms in varying conditions. Building a strong isotherm correlation is desired, with an understanding of the relationship between the pores of the activated carbon sample, operating parameters, and the adsorbent. The present data could complement efforts in designing adsorbed natural gas storage systems. Experimental data was collected using a Constant Volume Variable Pressure (CVVP) apparatus, consisting of a temperature-regulated vessel containing the activated carbon sample dosed with varying adsorbents through a controlled dosing vessel. Analysis of the derived data gave a well-fitted Tóth adsorption isotherm, giving the maximum specific adsorption capacity of the activated carbon to be 2.28 g of propane per gram of activated carbon with a standard error of regression
Optimization of bio-based cellulose-phosphate hydrogel production from rice husk waste using the Taguchi method Aprilyanti, Selvia; Pratiwi, Irnanda; Andalia, Winny; Aprianti, Tine; Faritzie, Hariman Al
Teknomekanik Vol. 9 No. 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i1.47172

Abstract

This work reports the development and statistical optimization of a fully Bio-based absorbent hydrogel synthesized from rice husk–derived cellulose via phosphoric acid crosslinking. Cellulose was extracted through sequential chemical treatments and subsequently converted into a phosphate-crosslinked hydrogel using a controlled synthesis process. A Taguchi L16 (4⁵) orthogonal array was employed to optimize four key synthesis parameters: cellulose content, reaction time, heating temperature, and phosphoric acid volume. Hydrogel structure and morphology were characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). FTIR results confirmed the formation of phosphate ester linkages, indicating successful crosslinking, while SEM observations revealed a porous and interconnected network structure favorable for water absorption. The optimized hydrogel formulation achieved a maximum swelling ratio of 91.25 g/g, demonstrating effective absorbent performance despite the absence of synthetic monomers or grafting agents. These findings indicate that rice husk waste can be efficiently valorized into an environmentally benign absorbent material through a simple and statistically guided synthesis route, supporting sustainable hydrogel development and agricultural waste utilization.
Co-Authors Amri, Julil Anggriani, Ulfa Meila Aulia, Nia Chua, Hui Tong David Bahrin Diu, Chan Emilia Agustina , Tuty Fajri Vidian Fitrializa, Ulfa Hapsari, Harrini Mutiara Hariman Al Faritzie Helmy Alian Heni Fitriani Irnanda Pratiwi Kandadai, Srinivasan Madagaskar, Madagaskar Manurung, Samuel Takkas Maulana, Gilang Rifki Melwita, Elda Muhammad Faizal Muhammad Muslim, Muhammad MUHAMMAD SAID Nafisah Koenang, Jilan Novia Novia Permata, Debby Yulinar Pham, Kallan Prayesi, Mutiara Rizki Putra, Imam Gunawan Qomarul Hadi Ramadhan, Daud Ramadhan, Rizky Fajar Ramadhoni, Muhammad Fathur Arya Repaldo, Repaldo Rif'at, Aditya M Rita Maria Veranika, Rita Maria Ryan, Greg Sarie, Tri Mulyani Selpiana, Selpiana Selvia Aprilyanti, Selvia Siregar, Edwin Fernando Sisnayati Sisnayati Sobey, Justin Sprivulis, Ben Srinivasan, Kandadai Tan, Evan Taufik Arief Teguh, Dedi Tuty Emilia Agustina Winny Andalia